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暗光子的幺正性约束与对撞机搜寻

Unitarity Constraints and Collider Searches for Dark Photons

Yasaman Hosseini, Mojtaba Mohammadi Najafabadi

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19 pages, 7 figures
发表信息：
Physical Review D 106, 015028 (2022)
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AI总结：

本文从分波幺正性约束和高亮度 LHC 及未来 μ 子对撞机搜寻两方面研究暗光子，表明可将动力学混合强度探测至 $10^{-4}$ 量级。

摘要：

暗光子由多种新物理模型预言，并正在各类实验中被深入研究。在本文第一部分，我们通过允许的 $VV\ ightarrow VV$ 散射过程，在大质心能量极限下（其中 $V=W,Z$），获得了暗光子参数空间的分波幺正性约束。在本文第二部分，我们利用预期的微分事例率，并结合包含全面本底过程集合的真实探测器模拟，对高亮度 LHC 上的双轻子以及双轻子加光子事例进行搜寻。在这些搜寻中，以优化方式使用灵敏的微分分布来确定对暗光子参数空间的灵敏度。结果表明，对暗光子模型取得了显著的灵敏度，对于质量在 $15$ GeV 至 $2$ TeV 之间的暗光子，动力学混合强度可探测至 $(1.4-10)\ imes 10^{-4}$。我们还研究了由 Muon Accelerator Program (MAP) 提出的未来 μ 子对撞机在不同质心能量下对暗光子模型的灵敏度。结果表明，未来 μ 子对撞机能够达到 $10^{-4}$ 量级的动力学混合灵敏度。

英文摘要：

Dark photons are predicted by various new physics models, and are being intensively studied in a variety of experiments. In the first part of this paper, we obtain partial wave unitarity constraints on the dark photon parameter space from the allowed $VV\rightarrow VV$ scattering processes in the limit of large center-of-mass energy, where $V=W,Z$. In the second part of the paper, searches are performed using the expected differential rates with a realistic detector simulation including a comprehensive set of background processes on dilepton and dilepton plus a photon events at the High Luminosity LHC. In these searches, sensitive differential distributions are used in an optimized way to determine the sensitivity to dark photon parameter space. It is shown that remarkable sensitivity to the dark photon model is achieved and kinetic mixing strength can be probed down to $(1.4-10)\times 10^{-4}$ for dark photon mass between $15$ GeV to $2$ TeV. We also investigate the sensitivity of a future muon collider suggested by the Muon Accelerator Program (MAP) to the dark photon model at different center-of-mass energies. It is shown that a future muon collider is able to reach a sensitivity to kinetic mixing at the order of $10^{-4}$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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